Quarterly report pursuant to Section 13 or 15(d)

Recent Accounting Pronouncements (Revenue Recognition) (Details)

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Recent Accounting Pronouncements (Revenue Recognition) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Inventories $ 1,510   $ 1,510   $ 1,384 $ 1,411
Other current assets 200   200   114 125
Other current liabilities 166   166   123 169
Accrued liabilities 926   926     1,125
Deferred income tax liabilities 2,091   2,091   2,502 2,500
Retained earnings 5,784   5,784   $ 9,074 9,068
Net revenue 3,233   6,463      
Cost of retail sales 2,050 $ 1,494 4,143 $ 2,999    
Selling, general and administrative expenses, including stock-based compensation and transaction related costs 428 248 880 498    
Operating expense 238 150 466 301    
Income tax (expense) benefit (25) (76) (54) (160)    
Net income 187 $ 175 571 $ 682    
Other Current Assets            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Inventory expected return current 67   67      
Other Current Liabilities            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Sales return liability current 167   167      
Before Adoption | ASU 2014-09            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Net revenue 3,210   6,375      
Cost of retail sales 2,053   4,131      
Selling, general and administrative expenses, including stock-based compensation and transaction related costs 393   817      
Operating expense 241   464      
Income tax (expense) benefit (26)   (52)      
Net income 192   562      
Adjustment | ASU 2014-09            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Inventories           (27)
Other current assets           (11)
Other current liabilities           (46)
Deferred income tax liabilities           2
Retained earnings           $ 6
Net revenue (23)   (88)      
Cost of retail sales 3   (12)      
Selling, general and administrative expenses, including stock-based compensation and transaction related costs (35)   (63)      
Operating expense 3   (2)      
Income tax (expense) benefit (1)   2      
Net income $ 5   $ (9)